Related Manuals for Marley MD Series
Summary of Contents for Marley MD Series
- Page 1 u s e r m a n u a l MD cooling tower I N STA L L AT I O N - O P E R AT I O N - M A I N T E N A N C E Z0602117_F ISSUED 8/2018 READ AND UNDERSTAND THIS MANUAL PRIOR TO OPERATING OR SERVICING THIS PRODUCT...
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Page 2: Table Of Contents
contents This manual contains vital information for the proper installation and Note Note operation of your cooling tower. Carefully read the manual before installation or operation of the tower and follow all instructions. Save this manual for future reference.. Overview ............................3 Tower Location ........................... -
Page 3: Overview
If you have questions about the operation and/or maintenance of this cooling tower, and you don’t find the answers in this manual, please contact your Marley sales representative. When writing for information, or when ordering parts, please include the serial number shown on the cooling tower nameplate. -
Page 4: Tower Location
If you have questions about the adequacy of the available space and the intended configuration of the tower, please contact your Marley sales representative for guidance. -
Page 5: Receiving Tower
receiving and hoisting Receiving Tower Prior to unloading the tower from the delivering carrier, inspect the shipment for evidence of damage in transit. If damage is apparent, note the freight bill accordingly. This will support your future recovery claim. Find and remove the installation instruction drawings and bills of material located in a plastic container in the cold water basin. -
Page 6: Tower Installation
1. Prior to placement of the tower, confirm that the supporting platform is level, and that the anchor bolt holes are correctly located in accordance with Marley drawings. 2. Place bottom module on your prepared supports, aligning anchor bolt holes with those in your supporting steel. Make sure that the orientation agrees with your intended piping arrangement. - Page 7 If tower purchased is one fan cell only, ignore steps 4 through 8. Note 5. If collection basins are to be equalized by the use of Marley standard flumes, unbolt the coverplate from the basin of the cell just installed. The coverplate is located in the collection basin depressed section end.
- Page 8 installation Side outlet sump connection: For shipping purposes, sumps are at- tached upside down in the basin to prevent damage. Sumps are to be installed in the square opening in the floor of the cold water basin of one or more cells—sealed against leakage, and attached by machine bolts, according to the installation drawing included.
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Page 9: Motor Wiring
Do not deviate from the motor nameplate wiring. Internal space heaters may be present, depending upon the motor manufac- turer. For space heater operation and wiring refer to the Marley “Fan Motor” User Manual” User Manual Z0239042. Either of following symbols may be shown on the motor nameplate –... - Page 10 User Manual for that system. Most VFD problems can be avoided by purchasing the Marley drive system. If you are installing a VFD other than the Marley drive, please refer to that drives installation manual.
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Page 11: Mechanical Equipment
Technologies does not assume responsibility for any technical support or damages for problems associate with non-Marley brand VFD systems. Changing the operational fan speed from the factory settings could cause the fan to operate in an unstable region which may result in damage to the equipment and possible injury. -
Page 12: Tower Startup
installation If tower is equipped with a two-speed motor, check for proper rota- Caution tion at both speeds. Check also to see that starter is equipped with a 20 second time delay which prevents direct switching from high speed to low speed. If the fan is intended to be reversed for deicing purposes, make sure that the starter is equipped with a 2 minute time delay between changes of direction. - Page 13 installation 3. Remove any and all accumulated debris from tower. Pay particular atten- tion to inside areas of cold water basin, louvers and drift eliminators. Make sure that cold water suction screens are clear and properly installed. 4. Fill the water system to an approximate depth of 7" in the depressed area of the cold water basin at the center of the tower.
- Page 14 installation Some trial and error adjustment of the float valve may be required to balance the makeup water with tower operation. Ideally, the float valve setting will be such that no water is wasted through the overflow at pump shutdown. However, the water level after pump start-up must be deep enough to assure positive pump suction.
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Page 15: Tower Operation
operation Tower Operation General: The cold water temperature obtained from an operating cooling tower will vary with the following influences: 1. Heat load With the fan in full operation, if the heat load increases, the cold water temperature will rise. If the heat load reduces, the cold water temperature will reduce. -
Page 16: Freezing Weather Operation
Your primary concern is to prevent the formation of destructive ice on the cooling tower fill air inlet and louvers. Your understanding of cold weather operation will be enhanced if you read Marley Technical Report H-003 “Cooling Towers and Freezing Weather”. - Page 17 operation Slushy, transitory ice forms routinely in the colder regions of the fill Note at low temperature. Such ice normally has no adverse effect on tower operation, but its appearance should be a signal to the operator to undertake ice control procedures. It is the operator's responsibil- ity to prevent the formation of destructive (hard) ice on the cooling tower fill and louvers.
- Page 18 Several methods are used to combat this, including automatic basin heater systems available from Marley. Unless some means of freeze prevention is incorporated into your...
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Page 19: Water Quality And Blowdown
operation Water Quality and Blowdown Maintaining Water Quality: The steel used in MD towers has been galvanized with a heavy zinc coating averaging 2.0 mils in thickness. The MD stainless steel option is even more corrosion resistant than galvanized steel in certain environments. Other ma- terials used (PVC fill, drift eliminators, and louvers, aluminum fans, etc.) are selected to offer maximum service life in a “normal”... - Page 20 operation Blowdown: A cooling tower cools water by continuously causing a portion of it to evaporate. Although the water lost by evaporation is replenished by the makeup system, it exits the tower as pure water—leaving behind its burden of dissolved solids to concentrate in the remaining water.
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Page 21: Cooling Tower Inspection And Maintenance
For additional technical support, contact your Marley sales represen- tative. For help identifying the sales representative in your area, visit spxcooling.com/replocator. -
Page 22: Belt Tensioning
maintenance Belt Tensioning: Always shut off electrical power to the tower fan motor prior to Warning performing any inspections that may involve physical contact with the mechanical or electrical equipment in or on the tower. Lock out and tag out any electrical switches to prevent others from turning the power back on. - Page 23 maintenance To turn the rod(s), the rod retention bracket(s) must first be moved. On the models with motors located externally loosen the thumbscrew holding this bracket in place and rotate the bracket away from the assembly. On models with the motor located in the plenum the rod retention is held in place with fasteners.
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Page 24: Sheave Alignment
maintenance early failure. Specific tools are made to measure the tension of a V-belt drive system. A Dodge® V-Belt Tension Tester, Browning® Belt Tension Checker or equivalent an alternative should be used for tensioning V-belts. Check with you local belt supplier. Belt tension is measured by applying a force perpendicular to the belt at the center point between motor and fan sheaves. -
Page 25: Fan Motor Access And Removal
maintenance each other and level within ⁄ ° ( ⁄ " in 12") in order to not adversely affect belt and sheave life. Sheave Assembly Bolt Torque • Alignment can be achieved by placing a straight edge across the top of ft·lb N·m Busing Type... - Page 26 maintenance MD5006 through MD5010 models’ fan motors are oriented with the shaft up. The motor may be hoisted by threading an eye bolt into the motor shaft and lifting with a hoist. To remove the motor fastener hardware, lift on the motor slightly with the hoist to remove the weight from the fasteners, then loosen and remove motor fasteners.
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Page 27: Cold Water Basin Access / Air Inlet Louver Removal
maintenance slightly with the hoist to remove the weight from the motor fasteners, then loosen and remove motor fasteners. If the motor is removed from the mounting plate, it should be reinstalled at the torques specified—do not lubricate the bolts. Motor Mounting Bolt Torque Galvanized Stainless... -
Page 28: Access Door Operation
maintenance Access Door Operation: Always shut off electrical power to the tower fan motor prior to Warning performing any inspections that may involve physical contact with the mechanical or electrical equipment in or on the tower. Lock out and tag out any electrical switches to prevent others from turning the power back on. - Page 29 maintenance Eliminators may be used as a walking surface for tower inspec- Note tion and typical maintenance. For those instances of frequent or prolonged servicing, it is necessary to protect the surface with plywood or planking. To remove the eliminator, stand inside the access panel and lift with two hands on an eliminator section, this will indicate where one section stops and another starts.
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Page 30: Distribution System Maintenance
Each nozzle should have a turbula- tor inside the outer shell—see image. If the nozzle appears broken or damaged, consult your Marley representative for replacement parts. Insert the nozzles by pressing it back into place inside the rubber grommet. It may be necessary to wet the nozzle and grommet to facilitate assembly. -
Page 31: Schedule Of Tower Maintenance
maintenance It may also be necessary to remove an entire branch arm from the spray sys- tem. Each arm is held in place with a retention strap bolted to the branch arm supports. Remove the bolts attaching the strap to the support and pull sharply on the branch arm to disengage from the header box. - Page 32 maintenance Always shut off electrical power to the tower fan motor prior to Warning performing any inspections that may involve physical contact with the mechanical or electrical equipment in or on the tower. Lock out and tag out any electrical switches to prevent others from turning the power back on.
- Page 33 maintenance in the fill or inconsistent coverage, this may be evidence of a clogged nozzle. Inspect nozzles for blockage. Every 3 months Lubricate fan shaft bearings. Each cell is equipped with extended lube lines protruding through the casing adjacent to the access door. While rotating equipment by hand, grease the bearings until a bead forms around the seals—a maximum charge of 0.75 ounces is recommended.
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Page 34: Seasonal Shutdown Instructions
The motor should be operated for three hours at least once a month. This serves to dry out windings and lubricate bearing surfaces (refer to Marley “Fan Motor” User Manual User Manual Z0239042. - Page 35 Marley sales representative. Replacement parts A complete stock of parts and components is maintained at one or more of the various Marley plants. In cases of emergency, they can normally be shipped within 24 hours—by air freight if necessary. However, you would obviously benefit from anticipating your need in advance, thus avoiding the cost of special handling.
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Page 36: Additional Information
In addition to these specific documents, SPX publishes numerous technical reports including more detailed information on a variety of cooling tower op- eration and service topics. Your Marley sales representative will be happy to give you copies of these reports at no charge. -
Page 37: Maintenance Schedule
maintenance schedule Maintenance Service Monthly Semi-annually Seasonal Startup or Annually Inspect General Condition and Operation Observe Operation of: Mechanical–motor, fan and drive mechanism Makeup valve (if equipped) Inspect for unusual noise or vibration Inspect and Clean: Air inlet PVC drift eliminators Nozzles Fan motor exterior Collection basin... -
Page 38: Troubleshooting
Too frequent starting or speed Set on/off or speed change set-points farther apart. Consider installing changes a Marley VFD for fine temperature control. Deterioration of grease or foreign Flush bearings and relubricate. Does not apply to motors with sealed material in grease bearings. - Page 39 Discuss remedy with Marley representative. Design wet-bulb temperature May have to increase tower size. Discuss remedy with Marley was too low representative. Cold-water temperature too Actual process load greater May have to increase tower size.
- Page 40 MD cooling tower U S E R M A N UA L SPX COOLING TECHNOLOGIES, INC. 7401 WEST 129 STREET Z0602117_F ISSUED 8/2018 OVERLAND PARK, KS 66213 USA © 2010-2018 SPX COOLING TECHNOLOGIES, INC. ALL RIGHTS RESERVED 913 664 7400 | spxcooling@spx.com In the interest of technological progress, all products are subject to design spxcooling.com and/or material change without notice.
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